Once you get started shooting with good form, which, as others stated, may require a good coach, a good routine is as follows.
I shoot 20 arrows a night after work. The main thing is that I only take 1 or 2 arrows out in the back yard with me. This forces me to put the bow down and go retrieve the arrows from the target every 1 or 2 shots. The goal is to take time in between shots. When I first started shooting years ago, I would have a dozen arrows with me, and I would just be flinging one after another, with no time in between shots. Taking time in between each shot really helps you focus on each shot, which is very important.